84 Carrera Sparkplug Socket Size
 

Really dumb question , is it 5/8 or 13/16?

Hi,

My sparkplugs take a 14mm sparkplug socket, which I guess is closer to a 5/8 than 13/16, although I don't know how good a fit a 5/8 is.

Charles must be using some very unusual spark plugs!!!

All of the spark plugs I have heard of for '65 thru '89 model 911 engines use a standard 13/16" spark plug socket ... including Bosch, NGK, Beru, Champion, Lodge, Nippondenso, etc. ...

Of course ... the early factory Klein 21 spark plug tool works best!

Why would you want to use anything but the factory tool? It is in the toolkit.

I just did mine (85 Carrera) and I am pretty sure I used the 13/16 (the larger one). Just verify on the new plug. Before you start the job, I highly suggest you also have a POCKET SIZE MAGNETIC PICK-UP TOOL. It came in handy for me for getting the socket back out after tightening the new plug.

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=91518

That is, IF it still has the rubber inside. I read a post on another board where somebody had the impression that the Klein 21 didn't have any rubber in the '72 tool kit. I let him hold on to his dreams...;) (edit) A word of caution looking for Klein 21's on ebay...not all of them have their rubber plug holding piece remaining. If that's gone, I'd say they make nicer paper weights than plug sockets.

Paul,

In the spare Klein 21 I got off eBay ... the rubber was pretty well chewed up. After cleaning it with Brakleen and B-12 Chemtool ... the rubber slipped out with a little encouragement from a spring grabber. I was able to duplicate it with a piece cut from the thickest part of a thornproof bicycle inner tube and 3M #8001 weatherstripping adhesive to hold it in place.

Great tip! Thanks Warren...